Homing Grenades

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Posted by WarZone (209.223.137.*) on February 06, 1999 at 15:02:42:

//========================================================================

void Homing_Think(edict_t *grenade) {

 vec3_t dir, forward, right, up;

 edict_t *ent = NULL;

 edict_t *best = NULL;

 float b_dist = 99999;

 float dist = 0;

if (grenade->delay > level.time)
return;

//pick the closest "enemy" or, keep the current one
/*
//uncomment this if you like
if (grenade->goalentity && grenade->goalentity->inuse && !grenade->goalentity->deadflag)
best = grenade->goalentity;
else
*/
while ((ent = findradius (ent, grenade->s.origin, 1500)) != NULL)
{
if (ent == grenade->owner)
continue;
if (!ent->takedamage)
continue;
if (OnSameTeam(ent, grenade->owner))
continue;

if (ent->deadflag == DEAD_DEAD)
continue;
if (!CanDamage (grenade, ent))
continue;

VectorSubtract (ent->s.origin, grenade->s.origin, dir);
dist = VectorLength (dir);
if (dist < b_dist)
{
b_dist = dist;
best = ent;
}
}
grenade->goalentity = best;

if (grenade->goalentity)
{
// gi.dprintf ("targeting %s\n", grenade->goalentity->classname);

// Calculate some directional stuff..
VectorSubtract(grenade->goalentity->s.origin, grenade->s.origin, dir);

vectoangles (dir, dir);
VectorCopy (dir, grenade->s.angles);
VectorCopy (dir, grenade->movedir);
AngleVectors(dir, forward, right, up);

right[0] += 5 * crandom();
right[1] += 5 * crandom();
right[2] = 0;

VectorNormalize(dir);

VectorMA(dir, 20 + 20 * random(), up, grenade->velocity);
VectorMA(dir, 10 * crandom(), right, grenade->velocity);
VectorMA(dir, 250, forward, grenade->velocity);

//make it roll :)
VectorSet (grenade->avelocity, 0, VectorLength (grenade->velocity), 0); // is that the right axis??
grenade->groundentity = NULL;
}
else if (rand() % 20 == 0)
grenade->think (grenade); // blow it up randomly if it can't find a target
}

//========================================================================
void Fire_Homing_Grenade (edict_t *self, vec3_t start, vec3_t aimdir, int damage, int speed, float damage_radius)
{
edict_t *grenade;
vec3_t dir, forward, right, up;

vectoangles (aimdir, dir);
AngleVectors (dir, forward, right, up);

grenade = G_Spawn();
grenade->owner = self;
grenade->activator = self;
grenade->goalentity = NULL; // Targeted Player.
grenade->classname = "hominggrenade";
VectorCopy (start, grenade->s.origin);
grenade->s.origin[2] += 10;
VectorScale (aimdir, speed, grenade->velocity);
VectorMA (grenade->velocity, 100 + random() * 30.0, up, grenade->velocity);
VectorMA (grenade->velocity, crandom() * 10.0, right, grenade->velocity);
VectorSet (grenade->avelocity, 300, 300, 300);
grenade->movetype = MOVETYPE_BOUNCE;
grenade->clipmask = MASK_SHOT;
grenade->solid = SOLID_BBOX;
grenade->s.effects |= EF_GRENADE;
VectorSet(grenade->mins, -3, -3, -3);
VectorSet(grenade->maxs, 3, 3, 3);
grenade->s.modelindex = gi.modelindex("models/objects/grenade2/tris.md2");
grenade->dmg = damage;
grenade->dmg_radius = damage_radius;
grenade->spawnflags = 1;
grenade->s.sound = gi.soundindex("world/airhiss1.wav");

grenade->delay = level.time + 1.5;

grenade->touch = Grenade_Touch;
grenade->prethink = Homing_Think;
grenade->nextthink = level.time + 10.0;
grenade->think = Grenade_Explode;

gi.linkentity(grenade);
}

Paste the above near the top of g_weapon.c then paste the following line somewhere in your sorce. As a test, you could also put this code at the top of the fire_grenade2() function with a "return;" right afterward to turn all of your hand grenades into homing grenades. Or, you might want to toggle the homing grenades via a client command. Its up to you.

 Fire_Homing_Grenade (player, start, aimdir, damage, 20, dmg_radius); // change the parameters as neccessary!

-- WarZone